



3 metal. such as copper. It will be understood that suitable means for maintaining a constant magnetic eld parallel to the cathode within the cathode space will be provided. Such means may consist oi' permanent magnet poles P, P positioned closely adjacent the outer faces of the end plates vaashswn. iaEig. 2, orian aloctromagnet coil coaxiallyrlspased with respedto thecatnode axis. High frequency energy may be taken out of the magnetron by any suitable means such salio" a coupling loop 9 linked with the axial magnetic flux of the electromagnetic ieldaeinulxinrmor the resonators and forming a contintimrcrthe center conductor ot a ooaxialtr r l0, as shown in Figure 1.

In operation, the anode structure and the' the adiacent'rescnawrs aroimd thesides of the vanes. "nie use df'two diiterent widths ofthe vanes? and t produca a structure which is essentially symmetrical for the r-mode but strongly non-symmetrical L'for the other modes. This tends'to cause the oscillator'to operatein the desired mode in whichthe dissimilar. adi'assnt resonators are 180 out.o,phalel.and.ths.-similar aiternatexesonators anainphase..

. Lshoivsamodicationnithestructura ot- A i.toA-xhereinthe-overall uidthoi operation.. mastnictlm that isobvisusiymuch simpler :and .ander to nanuzaeture than. .fa strapped.

While. I .have a iaw embodimantsoimninvmtiomitwili be apparent that myimentisnisbzno mesnsiimitedtothe minvsntionasfaetlorthiinsthe wpended dalms.

lsldmz han Mice hamm resonators at. the sides .ot said wallportions. alternateionespaLn-id wall portionshingfa tions having a different predetermined form, whereby the resonator wall dissymmetry thus produced favors f-mode operation oi.' the device.

2. An electron discharge device having an anode structure comprising a cylindrical conducting mailand. an alumina' soria of. spaced cnndncting radlily-etmding miles of equal radial dimension dening a central cathode space at their inner ends, each pair of adjacent van and said wall providing a cavity resonator closed YVl#iwauta'iibelniivspen on two sides and toward saidoathc space. and a pair of conducting wailsisdjamltiip themen sides o! said resonators ,-bntsmcaddsanaihot said vanes to permit electromagnetic between adjacent resonators at the sides. of said vanes. alternate ones dfsaidvaneshaving a predetermined form and timunaining vanes having a different predetermined form, whereby the vane dissymmetry thus produced avors "mods operation .otsaid devi.

3. .A magnetroncomprisinganeiongatedcathode, an anode structure including Aananniiis.: seriesotspacedradiallyextending-vanesoiqal radial dimension` concentric. with said cathode and aconducting wslhwmunding vthe nuts: endaotsaid vanesland providing with eachipain of adiacentnnesacarity resonator elosedst itsnuierendandopam on and .umani saidcathode, and means tarestablishingasnn stant magnetic field parallel Ywith vthe -axisvnf said cathodaandsaimancdesnda pair ntomdncting walls adiaeanttathasopen sideaoisai permit emipli iacentrssoaatwatthe. aidant saidvanu. altornata man: saidvaass having aprsdetsb mined fnrmmnd the. renaming umeshavini a dieratmneddnrminediermgwhareiav thomann thus-produced .fmvorsfwmcder amtionatsaidndevi.

4..An discharlc devieehsivins al anode'struetuee comprismg afrieacs adlwt cn'twnsidsfami atztheotbermdandswansd wtasndndiingawalirasndaipsir .dimm dmtinrwailamdilnenhto'tinopenmdesm! nil nescnatnrs brd: fsaaeedztmmiaii ot imrwalifplrtinns impermit eleetromasltiem piinmbssueenniinentrmntorsat timid midi mi! -mrtmudternatsmnesntisaid'w porties insinazmdstermhnd wintinnndziie otharaealirporions-havingmsinstanthily1iiihr .5am ods vcyiindricarecnduct ing wall mdsn annular series-of spaced nl. extending rimvaxly inomsa wallimd dening faseentmliealhodefspaoratithoir inner ends, saidfeylindrielimtil'mdeach pair-affiniticentmavoauity resonator elese'rhat its outer end andopslronftwsides and-toward sam lcathode space, msi a pair ofveonducdng mendicant tutheopemsidemt said'rescmtcll but spaoellffnm'm efmaidvann toapsrmiiuhe itetween :ailment resomattheskieaniinidamtmtsrmsem hanna a 'widih andthe ctinr vanqmhavinx azfrdiihrantrprshm mined. width.

Amas-natuur cnmprisinmimcsth ede, an anode including; :crisol ,miradisilyealtending una, all

form andstharemsininmwaltpu mtricitmsaidtaathadaisnd 

